Air purifier



1. Air purifier

1.1 : Front

1.2 : Back

1.3 : Left

1.4 : Right

1.5 : Top

1.6 : Bottom

1.7 : Perspective

FIGS. 1.1 - 1.7 are drawings showing an embodiment of the air purifier; the present product is used for purifying air; the broken lines form no part of the claimed design. 

CLAIM The ornamental design for an air purifier, as shown and described. 